RAKwireless WisDuo Breakout Board RAK11721 800MHz (EU868/RU864/IN865)

You can program the board using the RUI3 API within the Arduino IDE framework or via serial AT commands. Connect the board's UART pins to a USB-to-serial adapter, set the correct baud rate (typically 115200), and use the RAKduino board support package. For AT command mode, power the board and send commands like "AT+NWM=1" to set the LoRaWAN mode. Always ensure you have the latest RUI3 SDK from the RAKwireless GitHub repository for full feature support.

For optimal range, use a LoRa-specific antenna tuned to your region's frequency (e.g., 868MHz for EU). A 3dBi or 5dBi gain dipole antenna with an SMA male connector is recommended. Ensure the antenna's impedance is 50 ohms to match the SX1262 transceiver's output. The onboard chip antenna is for BLE only and should not be used for LoRa communications. Proper antenna selection and placement are critical for achieving the advertised >15km line-of-sight range.

The board requires a supply voltage between 1.8V and 3.6V, ideal for a single 3.3V regulator or a 3.7V Li-ion battery. To minimize consumption, utilize the deep sleep modes available via RUI3 APIs, such as `api.system.sleep.all()`, which can reduce current to ~2.37µA. Ensure unused GPIOs are configured correctly and disconnect peripheral sensors when not in use. Measure your specific sleep current with a multimeter in series with the power supply for accurate battery life calculations.